The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: When Phoenix is telling everyone that the crystal is sealed, Rogue is standing behind Wolverine and Cyclops. A couple of shots later, she is several feet in front of them. (00:17:42)
The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: When the image of the X-Men are shown on a tree, Gambit's pants are the same blue color as his boots, when they should be black. (00:17:02)
The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: After Jean says goodbye to Cyclops, Wolverine's bare arms are the same yellow color as his outfit. (00:16:39)
The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: When Xavier is first shown watching the clips of the destruction happening across the planet, he is wearing a jacket and gloves. When he is shown again around 30 seconds later, he is now wearing a suit and tie. (00:11:20 - 00:11:54)
The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: When Jubilee rushes to Xavier to tell him about the black hole sun, Banshee's cape is suddenly missing. (00:06:32)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: When Cyclops and Corsair are boarding D'Ken's ship via the moving sidewalk, the speed at which the moving sidewalk is propelling them forward varies depending on the shot. (00:15:03 - 00:15:29)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: When D'Ken is berating Erik the Red for being defeated by the X-Men, he is sitting on a throne. He then stands up and calls Erik the Red a fool, and when the shot changes, the throne disappears. (00:09:47)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Gladiator is landing at Cassidy Keep, Jubilee, Gambit, Wolverine and Banshee are spaced apart. When the shot changes, they are standing side by side. (00:16:43)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Wolverine is first shown detecting scents in Xavier's room, the glove on Gambit's right hand is the same color as his flesh. (00:11:25)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Juggernaut throws Xavier out the open window, Xavier is shown going through roughly the middle area of the open space. When he is flying through the air from Banshee and Moira's perspective, he is falling from a higher position. (00:05:02)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Moira and Banshee are alerted to Xavier in distress, the building with his room is several yards away from the edge of the cliff. However, when Banshee dives to save Xavier from falling to his death, the edge of the cliff is now only a few feet from the building. (00:02:46 - 00:05:02)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Moira and Banshee's kiss is interrupted by Xavier's scream, his room is directly behind them. Moments later when Moira and Banshee are running to his room, it has moved significantly to the left of where they were just kissing. (00:02:44)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Moira is telling Banshee that Xavier has given everything for his students, she has her left hand placed on Banshee's right arm, and her right arm is down at her side. Then when she remarks that she thinks she's the only friend Xavier has, she is running her fingers through her hair. When this scene was shown in the previous episode however, she is grasping Banshee's arm with both of her hands, and she never runs her fingers through her hair. (00:02:26)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier is looking out at Banshee and Moira from the window to his room, he is facing the window directly. When the shot changes, his left profile is now facing the window. (00:17:31)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier lands his plane on the Muir Island helipad, the nose of the plane is directly to the right of Banshee. When the shot changes, Banshee is now standing a few feet in front of the nose. (00:17:01)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Dark Xavier knocks Cyclops into the wall, it leaves a small hole. When Cyclops gets up, the hole is now larger. (00:14:47)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Gambit is knocked into the hot dog stand, he is lying on his stomach with his left arm tucked and his right arm bent at the elbow. When the shot changes, both of his arms are now outstretched. (00:13:37)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Beast is saying "Doctor, the solar probe, its shielding should be able to protect us," his neck alternates being different shades of blue. (00:19:05)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Xavier is watching the shuttle launch, he has some sort of wheel on the right side of his hoverchair. Moments later when he regroups with Storm and Jubilee, the wheel is now missing. (00:09:17 - 00:10:07)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Cyclops is saying "They'll be safe in the isolation chamber " he and Jean Grey are standing near the lockers on the left side of the screen, four floor tiles away from the door. When the shot changes, the two of them have suddenly moved to the right, in line with the door, and only two floor tiles away from it. The floor tiles themselves are also now drastically smaller. (00:08:32)
Answer: Chris Potter, the original Gambit voice actor, did indeed quit the role in the 4th season. His last episode was The Phalanx Covenant Part 1 so it seems reasonable that Fox would limit the use of the character even though it was recast. It doesn't appear that Potter left the role due to animosity, he stated in an interview that he wished to play Gambit in the first live action X-Men film.
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